RECORD: Darwin, C. R. 1856.06.05. Woodward, A manual of the Mollusca; or a rudimentary treatise of recent and fossil shells. CUL-DAR72.70. Edited by John van Wyhe (Darwin Online, http://darwin-online.org.uk/)
REVISION HISTORY: Transcribed by Christine Chua and edited by John van Wyhe 8.2022. RN1
NOTE: Reproduced with permission of the Syndics of Cambridge University Library and William Huxley Darwin. The volumes CUL-DAR 72-75 contain Darwin's abstracts of scientific books and journals.
Woodward, Samuel Pickworth. 1851-6. A manual of the Mollusca; or a rudimentary treatise of recent and fossil shells. 3 parts. London. [Darwin Library in CUL Abstract in CUL-DAR72.73-7.]
Darwin, C. R. 1852-1860. 'Books Read' and 'Books to be Read' notebook. Text CUL-DAR128.- "June 5. Woodwards Rud Treatise on Conchology"
[69v and 70]
The accuracy ofslope of line A depends whether the Formations are equally & fairly divided which may be doubted.
All fresh discoveries will make the average Black line A slope more (for instanced add 4 or 5 Fam. to Cambrian) & the starting point will be carried further back
The long stop between Trias & Jurassic evidently due to few marine beds in Trias & non-discovery of Roman's (mem St. Cassian beds)
Mr Woodward Rud. Treatise on Recent & Fossil Shells
Table (p. 415.) of all?? Families of Recent & Fossil Shells here arranged according to periods at commenced: A set of steps, marking breaks, which almost everyone admits — & a great flat, broad steps, when Siluria begin} This is only an application of principle of previous table to some large genera to all the Families
Shows a beginning of Mollusca
It is not possible to doubt number of Forms has increased in world
How few families have become extinct
Woodward
Geolog
Citation: John van Wyhe, ed. 2002-. The Complete Work of Charles Darwin Online. (http://darwin-online.org.uk/)
File last updated 9 October, 2023